Hand router and cutter tool



Jan. 10, 1956 F. PRIVITERA HAND ROUTER AND CUTTER TOOL.

2 Sheets-Sheet 1 Filed March 27, 1955 Fig. 3

Fig. 2

1956 F. PRlVlTERA HAND ROUTER AND CUTTER TOOL 2 Sheets-Sheet 2 Filed March 27, 1953.

Fig. 4

Fig. 9 Fig. /0

F rancesco Pn'v/fera INVENTOR.

HAND ROUTER AND CUTTER TOOL Francesco Privitera, Manville, R. I.

Application March 27, 1953, Serial No. 344,970

3 Claims. (Cl. 145-121) My invention relates to improvements in hand router and cutter tools for cutting in circles in wood and the like.

The primary object of my invention is to provide a hand tool in which a carpenters bit brace is provided with novel and efiicient means for cutting in circles of selected radius and depth easily and quickly.

Another object is to provide a hand tool in which a bit brace is provided with a beam having a center pin therein on which the beam is revolved by the brace and novel cutter holding and depth gage means for the cutter are provided on the beam so that circular holes of selected radius may be cut in the work, or circular ornamental designs cut to a selected depth, for instance rosettes and the like.

Still another object is to provide a tool of the type and for the purpose indicated which is simple in construction, easy to handle, and comparatively inexpensive to manufacture.

Other and subordinate objects will become apparent when the succeeding description and claims are read with reference to the accompanying drawings in which:

Figure 1 is a view in side elevation of my improved tool in the preferred embodiment thereof;

Figure 2 is a view in horizontal section taken on the line 2-2 of Figure 1;

Figure 3 is a fragmentary enlarged view in longitudinal section, partly in side elevation, taken on the line 3-3 of Figure 2;

Figure 4 is an enlarged view in vertical transverse section taken on the line 4-4 of Figure 1;

Figure 5 is an enlarged exploded view in perspective of the parts of the tool holder and the cutting tool;

Figure 6 is a view in side elevation of a modified embodiment of my improved tool;

Figure 7 is a view in horizontal section taken on the line 7-7 of Figure 6; and

Figures 8, 9, and 10 are enlarged views in side elevation of modified cutters.

Referring to the drawings by numerals, and first to Figures 1 to 5, according to my invention in the preferred embodiment a bit brace 1 is provided comprising a shank 3 having the usual handle 5 rotatable therein intermediate the ends thereof and the usual crank 7 on its upper end terminating in the usual breast knob 9.

A cutter carrying compass beam 11 extends laterally from the shank 3 to the same side thereof as the crank 7 coplanar therewith. The beam 11 is fixed at one end thereof on a reduced vertical lower end 13 of said shank 3 fitted in a vertical bore 15 in said end of the beam and fastened in said bore 15 by a pin 17.

A pointed center pin 19 extends downwardly through a vertical bore 21 in the other end of the beam 11 in vertical alignment with the breast knob 9, which is to say, at the same distance from the shank 3 as said knob and is secured in the bore in selected vertically adjusted position by a setscrew 23 in said other end of the beam. The beam is graduated on at least one side in inches and fractions thereof, as at 25, from the center pin 19 with the States Patent 0 2,730,146 Patented Jan. 10, 1956 graduations numbered in ascending order from said center pin 19 and is provided with a longitudinal vertical slot 26, longer than the scale formed by said graduations, all for a purpose presently seen.

A holder 27 for a bar cutter 29, having a squared shank 31, is slidably mounted on the beam 11 for adjusting said cutter 29 along the beam relative to the center pin 19. The cutter holder 27 comprises a pair of complemental opposite bar grips 33, with confronting longitudinal V-shaped grooves 34 fitting against opposite sides of the cutter shank 31. The holder 27 is adjustable along the slot 26.

The grips 33 extend vertically through the slot 27 to hold the cutter 29 vertically for cutting below said beam 11 and are threaded below said beam 11, as at 35, with lower beveled ends 37 and upper ends 39 above said beam 11.

Means are provided on the grips 33 for clamping the same to the beam 11 to lock the cutter holder in different adjusted positions on the beam to variably space the cutter 29 from the center pin 19 according to the radius of the cut to be made. This means comprises an apertured channel clamping, slide block 41 fitting upwardly on the grips 33 and which straddles the bottom of the beam 11, a nut 43 turned on the threads 35 against said block 41 to engage the same with the beam and draw the grips downwardly in the slot 26, a pair of clamping slide blocks 45' at opposite sides of the upper ends 39 of said grips rabbeted as at 47, to fit over the upper edges of the beam 11, and a pair of pins 49 connecting said blocks 45 and extending through a pair of slots 51 in said upper ends 39 converging downwardly relatively and coacting with the pins 49, when said grips 33 are drawn downwardly by the nut 43 to clamp the blocks 45 to the beam 11 and cam the grips 33 at their upper ends 39 into clamping engagement with the upper end of the cutter shank 31.

A tapered nut 53 turned into the threads 35, below the nut 43, coacts with the beveled ends 37 of the grips 33 to cam the grips at their lower ends against the cutter shank 31.

As will now be seen by loosening the nut 43, the cutter holder 27 may he set along the beam 11 to register a mark 55 on the block 41 with a selected graduation 25 to set the cutter 29 according to the radius of the cut to be made and while the cutter 29 is held in the holder 27 by the grips 33, clamped thereto by the nut 53. Also by loosening both nuts 43, 53, the cutter 29 may be removed from the holder 27.

The depth gage means comprises a threaded beam supporting stem 57 extending vertically through the slot 26 with a Work engaging roller 59 on its lower end and Wing nuts 61, 63, therein for clampingly engaging the top and bottom of the beam 11. The stem 57 is preferably disposed between the cutter holder 27 and the shank 7 of the brace 1 and as Will be seen may be adjusted along said beam 11 as desired and vertically in the slot 26.

The cutter 29 is of the router single groove cutting type.

In the modified embodiment of the invention shown in Figure 6, the center pin 57 has the conventional bit shank 59 for insertion in the usual chuck not shown of a bit brace. The cutter 61 otherwise the same as cutter 29 is provided with a collar 63 and a wing nut 65 threaded on its upper end whereby said cutter is clamped to the beam 67 in ditferent positions along the slot 69.

In operating the preferred embodiment, the center pin 19 is placed on the Work 71 at the center of a circular piece to be cut out of the Work, or a groove to be cut therein, with the tool holder 27 adjusted and clamped to the beam 11, according to the radius of the cut to be made, and the stem 57 of the depth gage means adjusted so that the roller 59 will engage the Work when the cutter 29 has cut to the desired depth, and the beam 11 is re- 3 volved by the brace 1 to revolve said holder 27, cutter 29, and stem 57 to effect the cut.

The modified embodiment is used in substantially the same way but without depth gaging means;

To-cut a rosette design, a cutter of the double groove router and bead cutting type such as'shown'in Figure 8 is used in the holder 27, and to cut a double groove divided groove design; a tool suchasshown in Figure 9, whereas, to cut a double divided groove with side" edge rabbets a tool such as shown in Figure 10, maybe used. The foregoing will, it is believed, sufiice' to impart a clear understanding of my invention without further explanation. p

Obviously, other modifications of the invention than herein disclosed may be resorted to without departing from' the inventive concept and right is'herein'res'erved to such as fall within the scope of the appended claims;'

What is claimed as new is-as follows:

1. A hand router and cutter tool comprising a brace having a vertical shank and a crank on the upper end of the shank with a breast knob thereon, a beam extending laterally from the lower end of the shank and having a terminal center pin fixed to and dependingtherefrom'for engagement with a piece of work and revolving of the beam about the pin by operation of the brace, a bar cutter, and means mounting said cutter in depending position on the beam for revolving therewith over the work comprising a pair of bar grips at opposite sides of the cutter, a pair of blocks at opposite sides of the pair of grips and said beam and engaging over upper side edges of the beam, an apertured block on said pair of grips engaging the bottom of the beam, a nut threaded on the pair of grips for turning against the apertured block to screw feed said pair of grips downwardly of said blocks, and coacting camming devices on said-pair of blocks and grips camming said grips into gripping relation to said cutter upon downward movement of said grips.

2. A hand router and cutter according to claim 1, said devices comprising a pair of converging slots in said pair of grips, and' a pair of crosspins carried by'said-pair of blocks and extending through the pair of slots.

3. A hand router and cutter according to claim 2, said slots and pins coupling said pair of grips to said pair of blocks so that downward movement of the pair of grips clamps the pair of blocks to said beam.

References Citedin'the file of this patent UNITED STATES PATENTS 80,059, Connett July 21, 1868 181,633 Brown Aug. 29, 1876 458,091 Beauchene' Aug. 18, 1891 581,427 Olson Apr. 27, 1897 763,072 De Roseau June 21, 1904 1,189,487 Roth July 4, 1916 2,140,120 Tomarin Dec. 13, 1938 

